Simulation analysis of error sensitivity factors in radiometric calibration of infrared hyperspectral interferometer

Qi-feng LU; Yi-shu XU; Chun-qiang WU; Cheng-li QI

doi:10.3788/OPE.20202804.0867

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Simulation analysis of error sensitivity factors in radiometric calibration of infrared hyperspectral interferometer

Modern Applied Optics | 更新时间：2020-08-13

- Simulation analysis of error sensitivity factors in radiometric calibration of infrared hyperspectral interferometer
- Optics and Precision Engineering Vol. 28, Issue 4, Pages: 867-877(2020)
- 作者机构：
  
  1.中国气象科学研究院灾害天气国家重点实验室，北京 100081
  2.国家卫星气象中心中国遥感卫星辐射测量与定标重点开放实验室，北京 100081
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20202804.0867
  CLC： P412.27
- Received：30 October 2019，
  
  Revised：25 November 2019，
  
  Accepted：25 November 2019，
  
  Published：15 April 2020
- 稿件说明：
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Qi-feng LU, Yi-shu XU, Chun-qiang WU, et al. Simulation analysis of error sensitivity factors in radiometric calibration of infrared hyperspectral interferometer[J]. Optics and precision engineering, 2020, 28(4): 867-877.
DOI：

Qi-feng LU, Yi-shu XU, Chun-qiang WU, et al. Simulation analysis of error sensitivity factors in radiometric calibration of infrared hyperspectral interferometer[J]. Optics and precision engineering, 2020, 28(4): 867-877. DOI： 10.3788/OPE.20202804.0867.

摘要

鉴于对高精度高时空分辨率大气探测资料日益增长的科研和业务需求，我国正大力发展星载红外高光谱探测系统。星载红外高光谱干涉仪光机结构复杂，仪器状态会显著影响其定标精度。本文通过理论分析和仿真实验，分别讨论了内黑体发射率、低温黑体发射率、内黑体与环境温度差、非线性系数以及直流电压演算等误差敏感性因子影响辐射定标精度的特征。分析表明：定标辐射偏差的绝对值与内黑体/低温黑体发射率呈线性关系，且与内黑体与环境温度差、非线性系数、直流电压呈正相关；提高内黑体发射率和低温黑体发射率到0.985以上、控制内黑体与环境温度差在0.6 K左右、控制干涉仪的非线性效应系数低于0.04，这些方案均是实现0.1 K辐射定标精度的必要条件；辐射定标参数对定标辐射的影响特征结合地面真空实验的定标参数估计，可以迭代得到已测得和未知的定标参数的最优估计，从而提高定标精度。本文的研究结果对于红外高光谱干涉仪的参数设计以及辐射定标误差来源的识别和订正有着十分重要的意义。

Abstract

Owing to the increasing demand of atmospheric sounding data with high precision and high temporal/spatial resolution

onboard infrared hyperspectral sounding systems

such as interferometer

are being developed extensively. Because of the inherent complicated optical structure of interferometer

the calibration precision is highly affected by the status of the instrument.The sensitivity characteristics of calibration precision were analyzed in this study

with regard to the status of the instrument

such as inner calibration blackbody (ICB) emissivity

low temperature external calibration blackbody (ECB) emissivity

temperature difference between the inner blackbody and environment

nonlinear coefficient and darkcurrent (DC) voltage.The results show that: The absolute value of calibration radiation deviation is linearly related to the emissivity of ICB/ECB

and has a positive correlation with the temperature difference between the ICB and environment

nonlinear coefficient

and DC voltage. To achieve the 0.1 K radiometric calibration accuracy

it is imperative to increase the emissivity of ICB/ECB to greater than 0.985. This controls the temperature difference between the ICB and environment

setting it at approximately 0.6 K and the nonlinear effect coefficient at less than 0.04. The influence of the radiometric calibration parameters on calibration radiation combined with the estimation of calibration parameters in the ground vacuum experiment enables initeratively obtaining the optimal estimation of the measured and unknown calibration parameters

thereby enhancing calibration accuracy. The findings of this study are highly significant in the design of the parameters of the infrared hyperspectral interferometer. They also aid in the identification and correction of the source of the radiometric calibration error.

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references

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